SELinux defines process types (domains) for each process running on the system

You can see the context of a process using the -Z option to psbP

Policy governs the access confined processes have to files. SELinux ddclient policy is very flexible allowing users to setup their ddclient processes in as secure a method as possible.

The following process types are defined for ddclient:

ddclient_t

Note: semanage permissive -a ddclient_t can be used to make the process type ddclient_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

SELinux policy is customizable based on least access required. ddclient policy is extremely flexible and has several booleans that allow you to manipulate the policy and run ddclient with the tightest access possible.

If you want to allow all daemons to write corefiles to /, you must turn on the daemons_dump_core boolean. Disabled by default.

setsebool -P daemons_dump_core 1

If you want to enable cluster mode for daemons, you must turn on the daemons_enable_cluster_mode boolean. Enabled by default.

setsebool -P daemons_enable_cluster_mode 1

If you want to allow all daemons to use tcp wrappers, you must turn on the daemons_use_tcp_wrapper boolean. Disabled by default.

setsebool -P daemons_use_tcp_wrapper 1

If you want to allow all daemons the ability to read/write terminals, you must turn on the daemons_use_tty boolean. Disabled by default.

setsebool -P daemons_use_tty 1

If you want to deny any process from ptracing or debugging any other processes, you must turn on the deny_ptrace boolean. Enabled by default.

setsebool -P deny_ptrace 1

If you want to allow all domains to use other domains file descriptors, you must turn on the domain_fd_use boolean. Enabled by default.

setsebool -P domain_fd_use 1

If you want to allow all domains to have the kernel load modules, you must turn on the domain_kernel_load_modules boolean. Disabled by default.

setsebool -P domain_kernel_load_modules 1

If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.

setsebool -P fips_mode 1

If you want to enable reading of urandom for all domains, you must turn on the global_ssp boolean. Disabled by default.

setsebool -P global_ssp 1

If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Disabled by default.

The SELinux process type ddclient_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.

SELinux requires files to have an extended attribute to define the file type.

You can see the context of a file using the -Z option to lsbP

Policy governs the access confined processes have to these files. SELinux ddclient policy is very flexible allowing users to setup their ddclient processes in as secure a method as possible.

STANDARD FILE CONTEXT

SELinux defines the file context types for the ddclient, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.

- Set files with the ddclient_etc_t type, if you want to store ddclient files in the /etc directories.

Paths:

/etc/ddtcd.conf, /etc/ddclient.conf

ddclient_exec_t

- Set files with the ddclient_exec_t type, if you want to transition an executable to the ddclient_t domain.

Paths:

/usr/sbin/ddtcd, /usr/sbin/ddclient

ddclient_initrc_exec_t

- Set files with the ddclient_initrc_exec_t type, if you want to transition an executable to the ddclient_initrc_t domain.

ddclient_log_t

- Set files with the ddclient_log_t type, if you want to treat the data as ddclient log data, usually stored under the /var/log directory.

ddclient_tmp_t

- Set files with the ddclient_tmp_t type, if you want to store ddclient temporary files in the /tmp directories.

ddclient_var_lib_t

- Set files with the ddclient_var_lib_t type, if you want to store the ddclient files under the /var/lib directory.

ddclient_var_run_t

- Set files with the ddclient_var_run_t type, if you want to store the ddclient files under the /run or /var/run directory.

Paths:

/var/run/ddtcd.pid, /var/run/ddclient.pid

ddclient_var_t

- Set files with the ddclient_var_t type, if you want to store the ddcl files under the /var directory.

Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.